Which of the following is a common sign of a stroke?

A common sign of a stroke is blurred vision. When a stroke occurs, it can affect various parts of the brain that control different bodily functions, including vision. Individuals may experience sudden trouble seeing in one or both eyes, which can manifest as blurred or double vision. This symptom is crucial to recognize, as it can help in identifying a stroke quickly and seeking immediate medical assistance.

The other options—persistent cough, frequent urination, and increased appetite—are not typically associated with stroke. Instead, they relate more to other medical conditions or problems and do not reflect the acute changes in neurological function that characterize a stroke. Recognizing the signs specific to a stroke is vital for timely intervention, which can significantly affect outcomes for the individual experiencing it.